Building ealse work



S. J. BRANSON.

BUILDING FALSE W-ORK.

APPLICATION FILED JUNE 26.1919.

Patented Dec. 2,1919.

2 SHEETSSHEET l 8. J. BRANSON.

BUILDING FALSE WORK.

APPLICATION FILED umrze, I919.

Patented Dec. 2, 1919.

2 SHEETSSHEET 2.

mm QM {UNITED STAT-ES SAMUEL BERANSON, OF CHICAGO, ILLINOIS,

BUILDING FALSE WORK.

Application filed. June 26,

To all whomz't-m-ay concern:

- Be it known that I, SAMUEL JosErn 13mm SON, a citizen of the United States, residing concrete of girders, beams, and floor-slabs in modern reinforced-concrete-fioored bui dings.

to-beam Among its principal objects are eflicacy, economy and simplicity; eflicacy in forming when erected a strong, firmly-joined, continuous matrix; economy, in imposing but a low requirement for laborboth in number of men and in point of timefor proper erection and wrecking, and also .in minimizing equipment necessary for speedy completion of a given job; and simplicity, both in the individual pieces and the manner of their interfitting, to make initial cost low and to require only ordinary labor for-the handling of the construction.

For the attainment of these objects, and others whichwill become apparent hereinafter, my invention consists in the combinations and the features of construction hereinafter set forth, and to be claimed; reference being had to the accompanying drawings, wherein Figure 1 shows, in perspective. the false work in use;

Fig. 2 is a. detail ofa joist-box-cover;

Fig. 3 is a'detail of a joist-boxside-piece;

Fig. 4 is a longitudinal section from beam- Fig. 5 is a ciosssection; and

Fig. 6 is a cross-section showing wrecking in progress.

It will be understood, preliminarily, that in building reinforced, pouredconcrete floors. it is usual to provide deep beams or girders running one way (say cross-wise, for uniformity of relative directions as herein expressed) these being connected by shallower joists at right angles" thereto and the supporting grid thus formed being closed by floor-slabs; all of those portions merging integrally and making a common floor-level.

The falscvork-matrix is usually of wood, (as is shown in the drawings) but metal may be used in lieu thereof in many parts. It is erectcd'to receive the concrete and rein- Specification of Letters Patent.

Patented Dec. 2, 1919,

1919. Serial No. 306,840.

forcing means which are duly placed; is left in place, in Whole or in part, until the concrete is sufiiciently set for stability; and then is knocked down and recrected for some other floor; In this regard, a falsework construction which will permit certain straintaking parts to be left in place, after the rest is wrecked, is important in order to insure the proper setting of the concrete and yet to enable the building of successive floors to go forward rapidly with minimum equipment.

Inthe construction shown I provide,-in general, what I will term girder-mold forms; joist-soflit forms and box forms; these c0- operating so that the box-forms, which underlie the floor slabs may be wrecked, after the concrete is poured, without displacing or disturbing the girder-mold and Joist-sOfiit forms, which constitute a supporting grid for the interlocking elements of the boxforms.

In the drawings G are girders; J arejoists and S are floor slabs, all of concrete.

Each girder form, 10, consists of atrough,

made in sections of suitable length'with bottom 11 and side boards 12, the whole supported on suitablepallets 13' and posts 14. The sides,'12, have spaced edge-notches 15 at their tops, as one convenient way of receiving and holding the bOlLtOIIl-SllfiPlHg portions of the joist-molds. These notches are preferably formed as gaps between short strips 16 secured along the side-board edges and in such notches there rest the ends of the flat bars 17 constituting joist-soifit forms each extending from one girder form to the next. Each of these joist-soffit forms is strongly braced against vertical bendin by a deep vertical web 18, making of the orm a vertical wooden T-beam. The ends of the web 18 are inclined, as at 19, for clearance 4 to facilitate wrecking, and near its ends, in order to assist in carrying the load, the web 18 finds support on rails '20 running along the irder mold sides and spaced therefrom by t e vertical battens 20.

The girder-forms 10 and. jolstsofiit forms, 17 it will be noted, constitute, a grid supported on the posts 14:, this grid being inde-- pendent of the box-forms and adapted to remain in place to sustain the s'otfits of the girders and joist s after the bolt-forms have been wrecked. -When the box-forms are in place the grid takes the load-sothat the box-forms may be of melee light construction as is advantageous to facilitate handling.

Each joist-sotlit form, 17, has on its web- 18 shoulder-blocks 21, and on these there rest, loosely, supporting cross-boards These parts attord in convenient fashion a readily-removable box-form support for each grid-space, on which supports the proper box-form 23, may be set up. Each box-form comprises separable side, end, and

top members, respectively numbered 25,

contact with the sides of the joist-soflit forms 17 and then :elves define the side faces of the joist-molding spaces. Spreaders 31, loosely laid across from rail to rail, and preferably abutting against the battens 28, keep the: side-boards from bulging away from the joist-sofl'it forms whenvthe concrete is poured. These side-boards I arrange so that they help to position the ends and tops of the box-mold, and I make themremovable, in wrecking, before the top and ends are taken down.

' The extremities of each side-board slope inwardly as shown, and the box-end members 26 lap over the side-board ends and rest in inclined position against them, preferably with the lower edges of said box-ends resting-on the girder-mold side-strips 1G. Battens or cleats 32, running vertically, in spaced relation up the elnbnuxmlwrs, protrude as studs 32' at their lower ends below the lower edge'of the e1idboard, and rest against the outside of the girdcr-side-board. Also they straddle a block or lug on the girder-side-board. In this way, as a simple and desirable specific detail, the end-hoards of the box-forms are positioned against end wise s ipping and against moving out of contact with the side-boards 253. And to aid in positionihg the top board 27v the endcleats 32 have a strap 34 secured across them at their upper ends, to complete a socket for a top-tongue It will be noted that, as illustrated in Fig. 6, the side boards 35 are free or removal in advance of: the end-boards 2'6 without disturbing the positio oi ihe latter, which define the upper portions of the girder-sides between the joists, and which, by virtue of their inclination. give the girders G a desirabh breadth and strength at their tops,

Each top board 27, hearing marginally upon the edges of the side-boards and end- -boards has suitable. reinforcing cross-cleats 36 and is provided with lengthwise tonguestrips 37, and crosswise tongue-blocks, 38, arranged ,to interlock with the appropriate parts of side and end boards, viz: the end tongues 38 of the top entering the sockets of the box-ends and held by parts 32, 34; and the lengthwise tongues 37 of the top entering between blocks 29 and the sideboards. In a sense, the top fits on the sides and ends like an inside-flanged cover but also it prevents the ends and sides from being outwardly displaced at their upper edges, as would an outside flanged cover.

In erection, the grid of girdle-forms and joint-solid forms first placed on supporting posts and pallets and then conveniently the loose parts are placed in this order: supports 22, sides 25, ends 26, spreader-s 31 and top'27. It will be observed that all boxform parts are merely placed in interlocking relation. without any necessity for nailing or other joinder, and that in their interlocked positions all parts of the box-structure are very strongly and solidly maintained against accidental displacement; the cross-supports 22 and spreaders 31, however, being easily demountable key-pieces which are not locked in position but are not apt to he accidentally displaced.

For wrecking, after the concrete has been poured or spread, the falsework is accessible, of course, only from below. One removes the Spreaders 31, knocks the supports 22 off the shoulder-blocks 21 and swings in and lowers the sideboards 25 as shown in Fig. (3. This trees the end-boards, which are then pried inwardly, unseating from the girder-inold-strips 16 as the cleats 32 escape beyond blocks 3 This frees the top, which is then readily taken down, if, indeed, it has not come down with the end boards. These parts being all rather light, they may be handled with greatest ease. The result of such partial wrecking is to leave the grid of ll'll'dtlrlOl'lllS and oist sofli-t forms in-" tact. This is of great advantage for the following reason among others:

In the erection of buildings I have found it entirely feasible to remove the box-forms about 24 hours after pouring of the concrete because the rather thin floor-slab portions carry little load and set readily; but for best assurance of a proper setting of the thicker, strain-carrying joists and girders it is very desirable to maintain their falsework support for a number of days. By my present construction, therefore, I am able to use one set of the box-mold parts in connection with two or more sets of the grid-mold parts, making one box-form equipment serve an entire building erected at say a floor-aweek rate. I

Taking down the grid,'as will be appar ent, is very simple, since removal of the: partsor shoring-14:, for any girder trees that girder form and the contiguous joist soliit-forms for lowering and withdrawal, each joist,-;for1n,-17, disengaging readily from its end sup orting girder forms.

It will be unc erstood that in wood construction falsework, as herein shown, permanently. connected parts, such 'as the cleats, rails, blocks, etc., are nailed or screwed to their respective carriers.

' While I'have herein described in some detail a specific embodiment of my invention in a form which I have found to be practical and satisfactory, I do not limit my invention in its broader aspects to details as shown, for many changes in construction may be made within the spirit of my invention and within thescope of the appended claims.

What I claim is:-

'1. Building falsework comprising girdermold members and .joist soflit mold members arranged for assembly to constitute a supporting grid,.and box-mold side and top. members adapted for assembly in inter locked relation to constitute closures for'the grid-openings and arranged for individual removal through saidopenings, in wrecking, without disturbing the grid.

2. Building falsework comprising girdermold'members and means to position them;

joist-sofiit form members separably mounted on said girder-mold members, each to shape the sofiit of a concrete joist and to support it in setting, and box-mold members comprising separable sides, ends and top, detachably mounted on the grid formed by said girder-form and joist-form members and removable saidseparable members individually from below through the grid openings.

3. Building falsework comprising, in combination, girder forms, joist-sofiit forms extending therebetween in spaced relation each comprising a flat topped strip and a vertical web, supports spanning between and carried by said webs, and box-forms "comprising interlocked top, end and s de' members, said side members bearing on said cross-supports.

4. Building falsework comprising spaced girder-troughs, T-beam' mst-Soilit forms resting on said troughs and spanningirom one to another thereof to form a grid and box-forms each composed of side, end and top members, which said members are removable through the opening betW'e-en the girder troughs and T-beams, said side and end members supported by the beams and girder troughs and said top interlocking with and overlying both the sides and ends.

Building it'alsework comprising girderforms, joist-sofiit forms supported by said girder forms and constituting therewith a grid and box forms comprising side men1- bers supported on the joist-sofi'it forms, end members supported on the girder forms and top members interlocking with the side and end members.

6. Builders falsework comprisilw in combination girder-forms, parallel and spaced apart; joist-soiiit forms at right angles thereto and bearing thereon to form a grid, supports loosely bearing on and supported by said joist-sofiit forms'for removal from below, and box-forms mounted on said supports and comprising side, end and top members interlocking at their tops and individually removable through the grid opening after removal'of said supports.

7. Builders falsework comprising, in combination, structure forming a grid, blocks fixed to opposite members of said grid, supports loosely laid on said blocks, spanning between'sald opposite grid-members and laterally removable therefrom, side box-members bearing on said supports, and end and top box-members cooperatmg with said side members, said end, side and top members interlocking for self-maintenance in erection position but for individual removal through the grid after removal of said supports. v V

8. Building falsework comprising, in combination, girder forms having notched upper edges, joist sofiit forms resting in said edge-notches and having supporting blocks, cross supports restingon said blocks, and box-forms each comprising sides carried by said cross supports, ends abutting thereagainst and a top interlocking with the sides and ends.

9. Building falsework comprising", in combination, girder forms, joist sofiit forms carried thereby and having supporting blocks; cross supports resting on said blocks and laterally removable therefrom, and box forms each comprising end members restingv on, looking with but inwardly removable from the girder forms, side boards between the ends resting on the cross supports but removable inwardly when the'latter have been displaced, and a top member interlocking with the side and end boards but permitting' their, stated removals.

10. In a. concrete falsework, a box-form: comprising side boards, end boards lapping the end edges of the side-boards, and a top board interlocking with the upper portions of the end and side boards and overlying their edges.

11. In a concrete falsework, a box-form comprising side boards, end boards lapping the end edges thereof, and a top board overlying the upper cdges of the end and side boards, and interloc ring means between the top board {and the upper portions of the end and side boards retaining the said upper portions against outward or inward displacement by rocking of the end or side upon inward displacen'ient of the lower portion of one of said peilmetral boards.

13. In concrete falsework a box-form comprising perimetral boards including side boards and and boards, and a top board, said boards, detachably inter-engaged. adjacent the top to prevent collapsing of the box by any 'latcral displacement of, the upper portion of any perimetral board orthe topboard and to permit downward removal of "said boards upon the inward displacement of the lower end of a perimetral board; and detachable means for preventing inward displacement of' any peri-metral board.

'14. In concrete falsework, a box form comprising side boards, end boards and, a top board, said side boards and end board and top board eing detachable flom each other and said top board having interlocking connection with said side boards and also with said end boards endwise of the end boards, whereby movement of said side boards in a, direction endwise of said end boards is restrained.

15. In concrete falsework, a box form comprising side boards, end boards, a top board, said side boards and and boards and top board being detachable romeach tween and abutting against said side boards,

said side boards and'end boards and top board being collapsible inwardly when said spreaders are removed.

16. In concrete 'false work, a collapsible box form comprising side n'ien'ibcrs and end lliGlI'lbOlS and a top member, such members being arranged to be interlocked and keyed together in erected position, for self-maintenance in such position and forready individual withdrawal downwardly, whereby said box-form is non-collapsible under pressure from without and may be wrecked from within. I

17. In concrete falsework the con'ibination of a collapsible box-form con'iprising perimetral members, including sides and ends, and a top member, such members having provision for interlocking detachably for self maintenance in erected position so long as the bottom edges of the perimetral men'ibers are not displaced, and for ready separation from within upon displacement of the bottom edge of one of said perimetral members, means to support said box form and readily detachable means for preventing displacement of the bottom-edge of any said perimetral member. I

SAMUEL J'. BR-ANSQN. 

